Bombyx mori rearing and Disease Control

1. What problems should be paid attention to in raising three-instar silkworms? The instar of the third-instar silkworm lasts about 96 hours, of which 72 hours are mulberry feeding and 24 hours are dormancy. The third-instar silkworm is still in the young silkworm stage physiologically, its growth speed is slower than that of the first and second instars, its body weight is 5~6 times higher than that of the second instars, and its adaptability to high temperature is different from that of the first and second instars.

(1) The best temperature for the third instar rearing is 25.5℃~26℃, and the difference between dry and wet is 2℃~3℃.

(2) Three years old mulberry should use mature leaves, not tender. Mulberry 4 times a day, feed cut leaves, cut leaves can be appropriate larger. Each seed leaf weighs about 16 kg.

(3) The area of silkworm seat is 4~4.5 square meters, which can be raised by six silkworm tablets.

(4) Pay attention to the drying of the silkworm seat, and the plastic film under the pad can be removed. And it's got to be covered with dry plastic.

(5) In the third instar stage, the sand was removed once before, during and after dormancy, and the silkworm body and seat were disinfected with No. 1 for preventing disease of silkworm.

2. What should I pay attention to before the silkworm will sleep? Silkworms should be given good mulberry satiety before dormancy, and attention should be paid to observing the mulberry feeding situation of silkworms.

(1) To ensure that leaves are given to silkworms and mulberry leaves are evenly given, so that silkworms should eat enough and have less leaves left, so as not to add too many leaves to silkworms when they sleep.

(2) When adding sleep nets, the amount of mulberry should not be too small, and the corners should be given to ensure that they are full and sleep, so that the body accumulates enough nutrients to meet the consumption needs of sleep.

(3) Before adding the dormancy net, the silkworm seat should be enlarged to the optimum area to avoid over-dense silkworm seat, and the silkworm seat should be enlarged ahead of time for the fast-developing varieties.

(4) Maintain standard temperature and humidity, and do not hypnotize at high temperature. The temperature in sleep is 25.5℃, and the humidity difference is 3℃~4℃.

3. How to control the sleep net period? When to add dormancy net is mainly decided according to the time of eating mulberry and the body color, posture and eating mulberry of silkworm.

Under suitable temperature condition, after eating mulberry for two days, the feces were soft, the silkworm body color was fried beige, and the dormancy net was added when the head and chest were enlarged and transparent.

Silkworm body is short and thick, skin is tense and bright, body color is silver white, among them, 0.5% individuals reach the stage of dormancy, which is the appropriate stage of dormancy.

In general, the optimum period of additional dormancy net is when 1~2 molting silkworms are seen.

The suitable period of adding dormancy net varies with varieties, instars and rearing temperature. The young silkworm stage should be earlier, the mature silkworm stage should be later, the Chinese variety should be earlier, the Japanese variety should be later, the temperature should be higher, the drying time should be earlier, the temperature should be lower and the humidity should be later.